Why is it die Demontage?

Demontage ends in -age, and almost all nouns ending in -age are feminine: in a German dictionary, 90% of them take die.

All nouns ending in -age
Sense 1
die

Meaning

[1] Reduction of objects

[1] Abbau von Gegenständen

Examples

[1] "What was not yet recognizable at the time is the fact that the Germans have become good part of their outdated machine park through the dismantling" "

[1] „Was damals noch nicht zu erkennen war, ist die Tatsache, dass die Deutschen ihren veralteten Maschinenpark durch die Demontagen zum guten Teil losgeworden sind.“

Declension

1 Singular Plural
Nominativ die Demontage die Demontagen
Genitiv der Demontage der Demontagen
Dativ der Demontage den Demontagen
Akkusativ die Demontage die Demontagen

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary